An arrastra (or arastra) is a primitive mill for grinding and pulverizing (typically) gold or silver ore. Its simplest form is two or more flat-bottomed drag stones placed in a circular pit paved with flat stones, and connected to a center post by a long arm.
An arrastra, also known as a Mexican Rastra, was a primitive method used by early miners to process gold and silver ores. It was introduced to the new world by the Spanish in the 1500’s. They were used throughout the world, often at remote locations where other processing methods were not feasible. It’s simple yet effective design made it a
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For gold ore, the gold was typically recovered by amalgamation with quicksilver. The miner would add clean mercury to the ground ore, continue grinding, rinse out the fines, then add more ore and repeat the process. At cleanup, the gold amalgam was carefully recovered from the low places and crevices in the arrastra floor.
Several hundred pounds of ore are then placed in the arrastra and the process was repeated. After running material for several weeks the grinding process would be stopped and the amalgam would be collected from the cracks in the bottom of the arrastra, then it
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PURPOSE: To obtain abrasive grains which have a specified shape and size and exhibit higher initial cut and higher total cut along with lower grinding forces. CONSTITUTION: The aimed articles for grinding are those having at least one abrasion surface and containing abrasion grains, a part of which is comprising small molded abrasion grains, the average thickness of which is ≤460 μ and the
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